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Alpha 87A Plate Choke Patch

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Back in 1997, I found an error in the Alpha 87A firmware code that operates the plate choke relay. Under certain circumstances, the plate choke relay doesn't close when it should. This can result in series resonances that can damage the plate choke windings or relay contacts.
 
Instructions for testing whether the error is present and applying the patch are contained in the following Word document:

87a-plate-choke-patch.doc

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